Revenue - Disaggregated by Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 108,893	$ 66,548	$ 193,310	$ 220,687
Revenue as a percentage	100.00%	100.00%	100.00%	100.00%
Product revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 70,345	$ 40,893	$ 122,301	$ 127,924
Revenue as a percentage	65.00%	62.00%	63.00%	58.00%
Rental revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 14,644	$ 11,535	$ 27,133	$ 47,698
Revenue as a percentage	13.00%	17.00%	14.00%	22.00%
Field service and other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 23,904	$ 14,120	$ 43,876	$ 45,065
Revenue as a percentage	22.00%	21.00%	23.00%	20.00%